Design a Scalable News Feed

Q: Design a Scalable News Feed

This question evaluates a candidate's competency in large-scale system design, specifically architecture, data modeling, API design, feed delivery strategies, caching and pagination, ranking versus chronological ordering, and consistency and reliability concerns for low-latency social news feeds.

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Question

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Design a large-scale social news feed service.

Users can:

create posts,
follow and unfollow other users,
open the app to see a personalized home feed containing recent posts from accounts they follow.

Discuss:

functional and non-functional requirements,
API design,
data model,
how posts are written and delivered into feeds,
fan-out-on-write vs. fan-out-on-read,
caching and pagination,
handling very high-fanout users (for example, celebrities),
ranking vs. pure reverse-chronological ordering,
consistency, deletion, and reliability concerns.

You may assume the system must serve a very large number of users with low read latency.

Design a Scalable News Feed

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